EP1080259B1 - Dirt remover - Google Patents

Description

The invention is concerned with an improvement of Dirt separating devices, in particular for removing dirt Use in a textile machine, for example in the blow room or in the card a spinning mill.

State of the art:

It is well-known practice today on the drum of both revolving covers as well of fixed-lid cards devices with "sucked-off knives". These devices are able to remove dirt particles from the processed material, while the fibers are carried on with the clothing of the drum. To suitable shuttering segments are in EP-A-431 482 and EP-A-366 918. A new arrangement for this purpose is in ours EP Application No. 978 106 95.3 shown on June 17, 1998 under No. EP-A-848 091 has been published.

The attachment of knives to formwork segments is also in US-C-4,314,387 and US-C-5,530,994, the latter of which Introduce an air flow between a segment and an attached one Element is provided. Similar air flows are in EP-A-366 692 and EP-A-338 802 explained, while EP-A-387 908 the importance of the air budget for the Cleaning effect emphasized. In all of these cases is the introduction of the air flow apparently only designed to improve the excretion of dirt, whereby Air turbulence is accepted or even desired. You are busy also exclusively with the area upstream of the knife in the Considered fiber transport direction. CH-B-668 085 also deals with the Construction of a dirt separator. The knife blade and the Suction chamber should be formed in one piece, the distance between the Suction chamber with the knife blade to the drum is adjustable.

CH-B-668 085 shows in Fig. 2 a solution that has a separating edge on a "knife blade" having. About the air currents in the working gap between this blade and the Drum is not said in CH-B-668 085. In an alternative embodiment (Fig. 4), the the embodiment according to FIG. 2 is apparently equivalent, that has the separating edge having wall piece on a curvature, which is a significant enlargement of the Working gap downstream of the cutting edge results.

The known systems are not only used for dirt separation devices in the Carding machine used, but also in other places in the spinning mill, e.g. in Cleaning machines (e.g. flake cleaners), the knives have (e.g. according to the first figure of DE-A-44 41 254).

According to EP-A-810 309, it is provided that there is also one in the filling shaft of the card Perform cleaning step. EP-A-894 878 shows a suitable arrangement for this a separating edge with a discharge associated with this edge.

The state of the art is therefore based on "knives" (also called "blades") where a "knife" normally has a blade. the opposite a rotating roller (e.g. a card drum) is adjustable. It is also known a similar function by an edge (also "separator" or "Ausscheidekante"), which edge is formed on an element is that is not necessarily designed as an adjustable "knife". The invention is also applicable in such arrangements. To avoid cumbersome repetitions in the Avoiding description is referred to below as an edge, whereby this term includes the special form "knife" or "blade".

The foregoing invention

The invention according to EP-A-848 091 (the "previous invention") is based on knowledge from that the air currents not only for the excretion of dirt but also play an important role in connection with the formation of nits. in the in the latter context, the development of turbulence is not desirable. In addition, the area downstream from the edge is as important as that Area upstream from the edge. These findings don't just apply to Dirt removal devices in the card, but also in other places in the Spinning, e.g. in cleaning machines that have separation edges.

The object of the invention according to EP-A-848 091 is the air balance improve downstream of the edge. This can cause air turbulence The formation of nits caused in fiber processing machines can be reduced. It can also improve the dirt excretion in and of itself become.

The foregoing invention provides a fiber processing machine with a Excretion edge, whereby both fiber and air in one essentially predetermined transport direction are guided past the edge and Dirt particles are selectively removed from the fiber / air stream by means of the edge should. The invention is characterized in that at least one measure is taken to the air flows in the zone downstream from the knife influence. The said measure can be taken in such a way that Air turbulence downstream (in the direction of transport) bounded by the edge or even be eliminated (if possible). In other words, downstream of the A flow pattern that is as laminar as possible is generated or maintained at the edge stay. Alternatively or additionally, the said measure can be taken in this way that the air separated by the edge is essentially without recirculation can be led away.

The measure preferably consists in the air being discharged through the edge is at least partially replaced by newly introduced air. The newly introduced air conveniently flows into the zone adjoining the edge, e.g. within 50 mm downstream of the edge and preferably within a distance of less than 20 mm. Flows in a solution the newly introduced air just behind the edge into the fiber / air flow. The Arrangement according to EP-A-848 091 can be made such that the effective Cross-section of the working gap downstream of the edge is widened, the degree of expansion at best cannot be determined in advance, e.g. when the position of the edge in the radial direction is set relative to the roller can be.

According to the preceding invention, therefore, means are provided, for example Allow air to flow into the room downstream from the edge. The said Means can be arranged such that air over substantially all of the Working width can flow, preferably as evenly as possible over the whole Working width. The edge is usually formed on an element that is in the Formwork of the roller is suspended. The formwork should be formed in such a way that the necessary air flow is created.

The arrangement is preferred with regard to the inflowing amount of air self-adjusting, i.e. (e.g.) that there is no need to work with blown air. If the free flow cross-section is sufficiently dimensioned for the air supply, the required air flow due to a negative pressure in the room downstream of the Edge.

EP-A-848 091 shows, in particular in Fig. 5, a solution with a separating edge, which in the direction of transport or flow is followed by a guide surface. The Relationship between the separating edge and the guide surface is variable in EP-A-848 091 (adjustable) because the guide surface is firmly attached to the drum, the Separating edge but is adjustable to its "immersion depth" in the fiber / air flow to be able to adjust.

However, it should be noted that the conditions in the removal are as delicate as those are in the working gap. On the one hand, the dirt must come out of the machine safely removed, on the other hand, the removal of the air budget in the working gap itself if possible do not disturb, because the latter air budget for the technological (elimination) effect the cleaning unit is decisive.

The complexity of the problem is also a function of the breadth of the work fiber processing machine (of the cleaning unit). With conventional So far, the machine has good machine widths of approx. 1000 mm as dirt removal or at least works satisfactorily. But it is known to be larger Use machine widths (e.g. up to 2000 mm in so-called cards) and it has been proposed in EP-A-866 153, the working width of the cotton card (and their filling shaft) from 1000 mm to approx. 1300 to 1500 mm.

The invention (aspect 1):

The object of the invention in a first aspect is to control the air budget improve the removal of dirt. However, there can also be one in this first aspect Improvement of dirt excretion can be achieved in and of itself. The invention can serve one or the other or both of these purposes.

In the first aspect, the invention provides a dirt separator with means (e.g. an edge) for deflecting ("peeling") air laden with dirt out of one Fiber / air flow into a dirt drain, e.g. in an elongated (over the Working width) channel. An apparatus according to the first aspect of the invention characterized in that blown air for conveying the dirt out of the discharge (from the channel) is used.

The invention is particularly, but not exclusively, for use in a Machine provided, which comprises a rotatable roller (drum or drum), the fiber / air flow in a "working gap" between the circumference of the roller and a surrounding formwork flows. An edge can be in the formwork be provided. The selectivity of the excretion is then achieved in that the roller is provided with a fiber-holding set, while the centrifugal force Dirt particles that are heavier or higher than the fibers Have flow resistance, pushing radially outwards (against the casing). The working gap normally extends over almost the entire axial length (over the "working width") of the roller and dirt is spread over the entire working width excreted.

A machine according to the first aspect of the invention is characterized in that that means are provided to blow air into a dirt Introduce dirt removal,

Blown air is preferably supplied continuously while the machine is in Operation remains. The blown air volume or the inflow location or the Air velocity at inflow can (or can be) selected such that Deposits in the canal are avoided, the air budget of the Dirt separator but is not disturbed by the blown air. The Air conditions in the duct can be selected such that the air flow in the Channel is generated only by overpressure, with the flow at one end of the channel a system working by means of negative pressure can be handed over for further transport can.

The invention (aspect 2):

Together with EP-A-848 091, the present invention sees in its second aspect a fiber processing machine with a separating or separating edge, where both fiber and air in a substantially predetermined direction of transport be led past the edge and dirt particles by means of the edge from the Fiber / air flow are removed. The edge is going through in the direction of flow followed by a flow guide. Means are provided to control the immersion depth of the To be able to set the cutting edge in the current, while setting the immersion depth the position of the guide surface in relation to the current has also been reset becomes.

The separating edge can be formed on one element and on another Element is attached, which has the guide surface. The attachment and that The aforementioned setting means are preferably provided in such a way that the separating edge and the guide surface maintain their mutual positions during adjustment.

An air intake is preferably downstream of the guide surface EP-A-848 091.

The guide surface can be formed as a shuttering of a working gap, the mutual positions of the edge and the guide surface are chosen such that the working gap downstream of the edge is not or not significantly (e.g. not spread more than 0.5 mm, preferably not more than 0.3 mm). The Arrangement can be made in such a way that no significant pressure drop in the Working gap downstream of the separating edge is created for any one Immersion depth of the separating edge.

The invention (aspect 3):

A dirt separator for use with a fiber / air stream in one The machine of the blowroom or the carding machine of a spinning mill includes one Separation edge and a flow guide. The element can be in Flow direction of the machine can be arranged upstream from the edge. On The discharge channel can be made by means of a first channel part provided with the edge and one second channel part provided with the flow guide element. The first and second channel parts can be used alone or together with other channel parts Form discharge duct, which serves in the machine, air peeled off by the edge and discharge material loaded with this air transversely to the main flow direction. The two parts can each be adjusted individually in relation to the fiber / air flow become.

Embodiments of the mentioned aspects of the invention are described below with reference to the schematic drawings described as examples.

Fig. 1

eine Kopie der Figur 1 aus EP-A-848 091 (und EP-A-431 482),

Fig. 2

einen Schnitt durch eine bevorzugte Anordnung nach EP-A-848 091,

Fig. 3

eine schematische isometrische Darstellung der bevorzugten Absaugung in einem Gerät nach Fig. 2,

Fig. 4 Fig. 4A

Kopien der Figuren 3 und 3A aus EP-A-894 878,

Fig. 5

eine Modifikation der Anordnung nach den. Figuren 2 und 3, um eine neue Anordnung nach dem ersten Aspekt der vorliegenden Erfindung zu bilden.

Fig. 6

eine Modifikation der Anordnung nach den Figuren 4 und 4A, um eine weitere Anordnung nach dem ersten Aspekt der vorliegenden Erfindung zu bilden.

Fig. 7

eine mögliche Modifikation der Anordnungen nach Fig. 5 bzw. Fig. 6,

Fig. 8

zwei Diagramme (Fig. 8A und Fig. 8B) zur Erklärung der erzielten Verbesserung,

Fig. 9

eine schematische Darstellung einer Ausführung der vorliegenden Erfindung in ihrem zweiten Aspekt

Fig. 10

einen Querschnitt durch eine mögliche Ausführung nach Fig. 9 zur Verwendung an der Trommel einer Karde,

Fig. 11

schematisch eine Anordnung zum Einstellen von Elementen gemäss Fig. 10,

Fig. 12

schematisch eine Teilstrecke der Mantelfläche der Trommel mit einem Gerät nach einem dritten Aspekt der Erfindung, und

Fig. 13

eine Modifikation der Anordnung nach Fig. 12.

It shows:

Fig. 1

1 a copy of FIG. 1 from EP-A-848 091 (and EP-A-431 482),

Fig. 2

2 shows a section through a preferred arrangement according to EP-A-848 091,

Fig. 3

2 shows a schematic isometric illustration of the preferred suction in a device according to FIG. 2,

Fig. 4 Fig. 4A

Copies of FIGS. 3 and 3A from EP-A-894 878,

Fig. 5

a modification of the arrangement according to the. Figures 2 and 3 to form a new arrangement according to the first aspect of the present invention.

Fig. 6

a modification of the arrangement of Figures 4 and 4A to form a further arrangement according to the first aspect of the present invention.

Fig. 7

5 a possible modification of the arrangements according to FIG. 5 or FIG. 6,

Fig. 8

two diagrams (FIGS. 8A and 8B) to explain the improvement achieved,

Fig. 9

is a schematic representation of an embodiment of the present invention in its second aspect

Fig. 10

9 shows a cross section through a possible embodiment according to FIG. 9 for use on the drum of a card,

Fig. 11

schematically shows an arrangement for setting elements according to FIG. 10,

Fig. 12

schematically a portion of the lateral surface of the drum with a device according to a third aspect of the invention, and

Fig. 13

a modification of the arrangement of FIG. 12th

Fig. 1 shows a schematic side view of the drum (the drum) 30 a Card, the end parts 32, 34 of a revolving cover assembly, which the The main carding zone defines the licker-in 36 (also called breeze) and one Pickup 38. The direction of rotation of the drum 30 about its axis A is indicated by the arrow D indicated.

In the pre-carding zone, between the licker-in 36 and the adjacent end 34 of the revolving cover assembly, there is a dirt separating device 439 and a formwork segment 40 preceding this device. The device 39 comprises two shuttering segments 42, 44, which are described in more detail below become.

The post-carding zone, between the other end 32 of the revolving flat aggregate and the pickup 38, with a further dirt separating device 46 provided, which is interchangeable with the device 39 and therefore not individually is described. Finally, it is in the sub-carding zone (between the Pickup 38 and the licker-in 36) according to FIG Dirt separating device 48 and four shuttering segments 445. Die Segments 45 are interchangeable with segment 40. The device 48 can can be replaced by two segments 45, but can (if it is maintained) can also be formed according to the preceding or this invention.

The device in Fig. 2 is for use on the outer surface of the main drum Carding provided, the direction of rotation of the drum as in Fig. 1 with the arrow D is specified. The outer surface of the drum carries a set, which is not shown is, since it does not play an essential role in the explanation and probably by the expert is known. A working gap is indicated by 10, with a separation gap 18 in the Formwork is provided and opens into the working gap 10. The separation gap 18 is covered by a hood (as will be described in more detail below) one end (not shown in FIG. 1) is connected to a suitable suction device, to discharge waste discharged through the gap 18.

The device is provided with a knife 66 which is inserted into the working gap 10 projecting separating edge 24. The knife 66 is e.g. by screws (not shown) attached to a part 62. The part 62 has a bearing surface for one corresponding area on the knife 66. After loosening up the The knife 66 can be fastened with the double arrow EP indicated directions are shifted, the bearing surfaces each slide. As a result, the position of the separating edge 24 relative to the Drum surface (or the set, not shown) can be changed. The Knife 66 also extends across the full working width, it is important that the position of the separating edge in relation to the lateral surface over the width if possible is set or adhered to immediately.

The fiber / air flow in the working gap 10 upstream from the edge 24 is in essentially by the peripheral speed and the "surface roughness" of the Roller (drum) influenced. The latter parameter is of course through procurement determined the set, not shown. The set position (the "immersion depth") the separating edge 24 compared to the formwork largely determines the proportion of incoming fiber / air stream, which "peeled" by the knife 66, into the Separation gap 18 is deflected and thereby removed from the working gap 10. The Adjustability is important because the part to be eliminated is processed Fiber material is dependent and not from the start (when designing the machine) can be set. The removed portion should be chosen such that the "peeled" air layers relatively many dirt particles (possibly also short fibers) and carry as few good fibers as possible.

The technology or functional principle of dirt removal can be any the known options can be chosen. Various devices for use in the card is e.g. in EP-A-387 908, EP-A-366 692, US-4,400,852, US-5,448,800, EP-A-520 958, DE-A-39 02 202, US-4,805,267, DE-A-33 31 362, US-4,797,980 and US 5,031,279.

In this case, the aforementioned hood is formed by a profile piece 50 (e.g. from hard anodized aluminum, or steel). The profile piece 50 extends over the entire working width and has a longitudinal channel K and an opening 52 provided that serves to form the separation gap 18, the gap 18 the Mouth of the opening 52 to the working gap 10 represents. The profile piece 50 also has two formwork parts 54, 56, of which one part 54 with a guide surface 58 is provided, which limits the working gap 10 together with the drum. The second Part 56 serves as a support for a guide element 60, which is exchangeably attached to the support to face the drum or its assembly after assembly.

The tapered wall part 62 between the surface 58 and the opening 52 is with a recess 64 which receives the blade blade 66. The through the sheet 66 air diverted from the working gap is replaced by new air, namely on from the edge 24 distal end of the guide surface 58. Between the wall 68 of the Profile piece 50 and the adjacent formwork element 70 is one Air supply opening 72 released, which in operation, the working gap with the Connects the environment outside the formwork. The distance X of the opening 72 from edge 24 is preferably less than 50 mm. The opening is 72 preferably in the form of a "slot" so that the opening overlaps spans the entire working range, although this is not an essential feature of the invention represents.

The guide surface 58 should be designed in this way and set close to the impact circle of the roller that there is no significant turbulence in the downstream working gap the edge 24 remaining fiber / air flow arise. For this purpose, the Surface 58 advantageously be set so close to the roller that none substantial spread of the current after the edge 24 is required. This can also a pressure drop in the working gap at or downstream from the edge 24 largely avoided. By maintaining more appropriate ones Pressure conditions at the edge 24 can cause air to return from the opening 18 in the working gap 10 can be avoided. It is also possible to be more precise "Peelable" portion of the fiber / air flow by adjusting the blade 66 adjust. Without this measure, it can do so under unfavorable conditions come that air circulation is generated within the opening 52 and Dirt particles get back into the working gap. The execution allows a lot narrow settings of the edge 24 or the surface 58 with respect to the tips of the Garnish on the roller. The distance of the edge 24 from the clothing tips can e.g. in the range 0.25 to 0.5 mm, and the distance of the surface 58 from the clothing tips can e.g. 0.8 mm.

According to the schematic illustration in FIG. 3, the inner surface 74 of the Profile piece 50 designed such that the discharged air is approximately tangential in the Longitudinal channel K enters and then, initially following inner surface 74, into the area around the middle of the longitudinal channel. This creates a spiral movement of the Air, together with the carried dirt particles or fibers. EP-A-848 091 suggests suction before, preferably from this central area at one end AE (Fig. 3) of the channel K takes place. Also according to EP-A-848 091 in the middle area on other end ZE air introduced into the channel K. This makes it possible over the Across the entire working width, approximately constant recording conditions at the separation gap 18 maintain. Nothing was said in EP-A-848 091 about the type of air supply, whereby the drawing in of air from the environment by negative pressure in the duct would be obvious.

• ein Ventilator V,
• ein Druckausgleichsbehälter DA,
• eine Rohrdüse RD, und
• Verbindungsleitungen VL.

FIG. 5 schematically shows a modification of the arrangement according to FIGS. 2 and 3, the channel viewed from a direction transverse to its longitudinal axis and again indicated by the reference symbol K. The effective length of the duct K (ie the length of the duct part of the air that has to take up from the working gap) corresponds to the working width of the machine and can be between 1000 and 2000 mm, preferably between 1000 and 1500 mm. The modification consists of adding the following elements:

• a fan V,
• a pressure expansion tank DA,
• a tubular nozzle RD, and
• VL connecting cables.

Instead of drawing supply air from the environment (as in FIG. 3), according to the present Invention (Aspect 1) Blown Air Used To Ensure That The Edge 24 separated dirt from the channel K is transported. The pipe nozzle RD will preferably directed slightly obliquely into the channel to the aforementioned spiral To support air flow

The tubular nozzle RD has a light width (a flow cross section) at its outlet, which is relatively small compared to the light width (the flow cross section) of the channel K. The blown air thus flows into the channel in the form of a bundled jet. The Flow cross section of the nozzle preferably corresponds to approximately 12 to 25% of Flow cross section of the channel.

• für ein Gerät in der Karde (Ausführung nach Fig. 5) insgesamt 20 bis 50 l/sec. eingeführt werden können, um eine Strömungsgeschwindigkeit im Kanal zwischen 5 m/sec und 15 m/sec zu ergeben, und
• für ein Gerät in einem Flockenreiniger (siehe die Ausführungen gemäss den Figuren 4 und 6) insgesamt 20 bis 50 l/sec. eingeführt werden können, um eine Strömungsgeschwindigkeit im Kanal zwischen 5.m/sec und 15 m/sec zu ergeben.

There is overpressure in the channel K relative to the surroundings of the channel, which determines the flow shape within the channel. This type of flow should be chosen in such a way that the air peeled off at the separating edge can flow away from the separating edge without interference. The required amount of air or the required air speed in the channel K depends in part on the speed and surface quality (the garnish) of the roller 30. The system is preferably designed such that

• for a device in the card (version according to FIG. 5) a total of 20 to 50 l / sec. can be introduced to give a flow velocity in the channel between 5 m / sec and 15 m / sec, and
• for a device in a flake cleaner (see the explanations according to FIGS. 4 and 6) a total of 20 to 50 l / sec. can be introduced to give a flow velocity in the channel between 5.m / sec and 15 m / sec.

In the embodiment shown in Fig. 5 is from a machine side (on a Blown in at the end of duct K). On the other side (at the other end of the channel) still aspirated, i.e. the discharge channel is connected to a pneumatic Transport system connected that works by means of negative pressure. The arrangement can be adapted to the machine construction by the suction concept for the Selection of the "suction end" is decisive and the compressed air supply at the other end he follows.

However, the invention is not based on the introduction of blown air at one end of the channel limited. For example, Air is blown in the middle of the duct and on both Ends are sucked off, or the air intake could be in different places of the Channel length can be distributed along. It could be in the "same" place in the longitudinal direction of the channel several blown air supply openings around the longitudinal axis of the Channel can be distributed. It could even be a channel in the form of a screen wall be provided, air flowing in through the screen wall over the entire length, which, however, requires a rather complex construction.

By means of the expansion tank DA, the air quantity fed in can be constant and be kept even. The periodic import of compressed air to the duct "Blow out" is not excluded according to the invention. The constant feed is but clearly preferred because it maintains constant pressure in the Channel K enables what is guaranteed to ensure predetermined air conditions in the Opening 52 (in the gap 18, Fig. 2) simplified. It can be done using this arrangement be ensured that no "process air" from the fiber-air stream in the working gap 10 is sucked off, the air layer peeled off from the edge 24, of course must be included. The air flow on the roller (drum) remains unaffected by the dirt removal in and of itself.

The channel K is efficiently rinsed out by the compressed air, so that the outlet is not in the Suction channel remains. The saddling of fibers on the separating edge 24 (Fig. 2) also diminishes what an improvement in excretion and the Leaving composition (fiber / particle ratio) results.

The invention is not limited to the application in the card, as now based on of Figures 4 and 6 is explained. 4A shows the essentials in cross section Elements of a new card filling shaft 8 with a cleaning module according to EP-A-894 878, in particular the upper part of the shaft (“feed shaft”) 31, the lower part Manhole part ("reserve chute") 34 with conveyor rollers 35, the material feed 32 with a Feed roller 321 and a feed trough 322 and an opening roller 33 (preferably a needle roller). A fill level sensor 325 is also shown in FIG. 4A. The one from the The cotton wool 9 supplied to rollers 35 is not shown in FIG. 4A in a connecting part 36 shown feed roller of the card. The side view (Fig. 4B) shows that Cleaning module viewed from the same shaft in the direction of arrow P (FIG. 4A), 4B, certain elements are partially cut away by the ones below to be able to display horizontal elements. The length of the roller 33 determines the Working width B of the machine. This working width can be 1 m to 2 m, preferably 1 m up to 1.5 m. The feed 32 must flakes as evenly as possible over the Working width B can deliver to the roller 33, and the cleaned material must be distributed as evenly as possible over the width of the shaft part 34. The rollers 321, 33 are rotatably mounted in side walls (not shown) and from these walls carried. The axis of rotation of the roller 33 is indicated at 170. The directions of rotation are each indicated by arrows.

The opening roller 33 (needle roller) provided with a set works here as one Transport roller, which the fiber material between the material feed 32 and the wadding device transported 34.35. In the direction of rotation of this Viewed transport roller, the "takeover point" is where the roller 33 fiber material takes over from the fiber beard offered by the feed, slightly before the highest Place on the transport route. The fiber material is sent to three separators 104,106,108 passed to then in a deflection area 20 am to reach the upper end of the lower shaft part 34. The elimination devices 104,106,108 are formed essentially the same, so that the description of the Device 104 is considered representative of the other two devices 106, 108 can be. Each separating device thus comprises a respective separating element 110 and one that precedes the separating element in the transport direction Guide element 112. Between guide element 112 and the one assigned to it Separation element 110 has a separation gap 114.

4A it can be seen that the first excretion device 104 is practical "directly" to the feed roller 321. Between the feed roller 321 and this first separation device 104 is only a guide rod 116 in the form of a Traverse, which the material captured by the opening roller 33 in the working gap conducts between the first guide element 112 and the transport roller. It is also each only a smaller distance s between a preceding device 104 or 106 and the following device 106 or 108 available. The leading edge of the last one Ausscheideelementes 110 is therefore in a horizontal plane E, which includes the axis of rotation 170 of the roller 33. This "geometry" is not mandatory required. The "level E" could e.g. continue in the direction of rotation of the roller 33 moved, e.g. by an angle of approx. 45 ° with the one shown to form a horizontal plane.

However, the cleaning is now carried out at least in part "above" the roller 33, i.e. above the illustrated horizontal plane E. Gravity helps accordingly neither the excretion nor the removal of dirt. each Device 104, 106, 108 therefore preferably includes its own dirt drainage, the ensures that the material excreted by the respective element 110 the area of the transport route is removed. The material to be removed is moving itself in the separation gap and in the discharge opening adjoining it in a direction that extends approximately tangentially to the roller 33. Preferably but as soon as possible this material is diverted in a direction that approximates extends parallel to the axis of rotation 170, at least up to one or the other side of the machine. Because gravity does not help, it can Dirt removal can be solved by means of an air flow and each device 104, 106, 108 is provided with its own discharge pipe 117, which is parallel to the axis 170 above the Working width extends. The individual tubes 117 can be on one machine side a common suction line (not shown) can be connected. The preferred connection is explained below with reference to FIG. 6.

With three separation devices 104,106,108 it is possible to get a sufficient one To achieve a degree of cleaning of the cotton pad 9, even if (according to EP-A-810 309) no fine cleaning (with a clamp supply) took place in the blow room Has. Due to the aforementioned shifting of the plane E in the direction of transport but space for a fourth excretion device can be gained. That after the Cleaning still moving with the roller 33 (after the front edge of the last Elimination element 110 remaining) fiber material can therefore be used for the deflection or the discharge into the reserve shaft 34 are prepared. This is the material initially by means of a guide surface 22 close to the outer surface of the garnished roller 33 guided, the material flow tends to tangentially from the roller 33 in one To fly away diagonally downwards. This inclination can be caused by an air flow L are supported, the flow of material after the guide surface 22 (in the Transport direction considered) mixed and further in the mentioned tangential Direction flows. The air flow L flows past the tips 331 of the roller set or possibly even through the outer ends of these tips. A suitable remedy. determining the optimal flow direction is explained in more detail below.

The material flow is thus largely replaced by the roller 33 and in the led downward converging material deflection region 20. In case that should individual flakes adhere to the clothing of the roller 33, this is the Cleaning module opposite casing 323 of the roller 33 with a Stripping or stripping edge 324, which protrudes from the set Strip off the flakes and redirect them to area 20. The casing 323 can e.g. be formed as a hollow profile, for example by extrusion. The corresponding part closes an adjacent one, with no reference numerals provided trough part that forms the trough 322. The latter part can also be used as Hollow profile are formed.

The casing 323 can also be provided with an inwardly projecting brush 326 with which individual fibers remaining in the clothing or in the clothing printed flakes removed from the set and redirected to area 20 can be before the relevant part of the garnished work surface back to the Clamping point of the feed 32 is returned.

An air flow L flows from a calming space 24 into a box 26, of which the a wall 25 is arranged obliquely around one side of the Form material deflection region 20. The opposite side of this Area 20 is formed in FIG. 4A by a vertical wall part 341 which extends upwards on the casing 323 and downwards on the one conveyor roller 35 adjoined. The wall part 341 has an opening for receiving the Level sensor 325 provided, but is not perforated and can the casing 323 have a seal opposite. The air flow flowing into the shaft part 34 can therefore not escape on this side of the shaft. The wall part 341 can be displaceable relative to the casing 323 by the "depth" of the shaft part 34 (in a horizontal direction perpendicular to the working width).

The top edge of wall 25 (as viewed from axis 170) is behind you Sheet metal piece, which forms the guide surface 22. On this wall edge one can Pivot axis 23 are attached, which extend over the side walls of the machine extends beyond (see Fig. 3B) and outside of these walls with at least one Adjustment lever 231 is provided. The axis 23 carries a wing 28 which together with the above-mentioned piece of sheet metal forms an inflow channel for the air flow L. The The piece of sheet metal itself is fixedly mounted opposite the roller 33, e.g. by a bent lip formed on the top wall 27 of the box 26. By the Swiveling the wing 28 can change the width and direction of the "curtain" designed air flow L are influenced or optimized. The lever 231 can can be operated manually or by a controlled actuator. But the wing can if necessary, be firmly attached in a predetermined, optimal position.

The air flow L is generated by a fan 29 and flows in via a flap 21 in into the calming room 24. The blown air could be obtained from the environment become. In the preferred solution, however, it is circulating air from the shaft part 34 obtained through holes (not specifically shown) in a wall part 342, which extends vertically downward from the lower end in the embodiment according to FIG. 4A the wall 25 extends and faces the wall part 341. There are already many "Perforated" walls known to be used in a cotton-forming duct that a detailed description of the wall part 342 is unnecessary. In the preferred solution, the perforated shaft wall is formed as a screen wall. being the Wall can be put together from parts (slats). Indifferent to that perforated wall is formed, the air emerging from the shaft part 34 in a chamber 343 collected and passed down until it passes over a Intermediate piece 344 is forwarded to the fan 29. The air flow through the Fiber mass in the shaft part 34 serves to compress the flakes stuck in what the uniformity of the cotton wool formed between the wall parts 341, 342 and finally therefore the cotton 9 delivered by the rollers 35 is considerably improved.

The amount of air required can be determined empirically. The fan 29 will but preferably at a constant speed from a motor, not shown driven. The amount of air required can be by means of a slide 210 or the construction of the flap 21 can be adjusted.

4 can not only be used in a card slot. The same approaches to designing a "cleaning machine" be used, which is to be used in a conventional blowroom line. When used in a fine cleaner, it will be possible to use a larger one To use opening roller. While the roller 33 has a diameter in the range 250 up to 300 mm, a fine cleaner should have an opening roller with a Diameter larger than 350 mm, e.g. approx. 400 mm. The working width can range from 1 to 1.5 m, e.g. 1.2 m. In a fine cleaner, at best it is important to use the circumference (the working surface) of the opening roller more intensively, than is possible or necessary in a filling shaft because the fine cleaner has a higher Material throughput has to cope (currently 500 to 600 kg / h). On the other hand, it is then not necessary to throw off the flake material, as it is known by a pneumatic transport system forwarded to the next machine in the line becomes. The "output" from the cleaning module to the transport system can therefore in can be provided substantially below the feeder, which takes up much space in the lower one Half of the roller for further separation devices (e.g. separation devices number 4, 5 and even leaves 6) at best. The cleaning elements on the lower half of the But the opening roller could also differ from the separating devices 104,106,108 distinguish, because on the lower half of the roller gravity at Material excretion or again plays a role in dirt removal.

Fig. 6 shows a modification of the module of Fig. 4 to match the first aspect of the adapt the present invention, with the same reference numerals indicated parts are identical to the corresponding parts in Fig. 4 and therefore not be described again. For the purpose of customization Connection lines VL from the box 26 in the three discharge channels 117 to Compressed air (with pressure + P) from the box 26 for removing dirt from the Dirt separators 104, 106, 108 to use. In this case that's why not even necessary, a special fan and surge tank to be provided, since these elements already exist in the new shaft. But it is possible to provide additional elements that serve to remove dirt. The function of the compressed air in the discharge duct is the same as that for FIG. 5 was described, making repetition unnecessary. The design of the Dirt separators 104, 106, 108 near the roller 33 are preferred according to EP-A-894 877.

7 shows an open transfer from a discharge channel 117 to the suction 500. What is wrong with the handover can be drawn in from the surroundings the further transport simplified. The suction channel 502 is therefore at its end in the Provide an open hopper 504 near the roller 33 and the discharge channel 117 extends into the open end of funnel 504. At the other end, the Channel 117 with a lid (be closed) or left open become.

The first aspect of the invention is not limited to these examples. As well on Licker of the card or in conventional cleaners (e.g. according to US-B-5,033,165) suctioned knives are used today, which by means of a compressed air supply in the Dirt removal can be improved. The invention can also be used in others Textile machines are used.

Fig. 8 shows the difference in the by means of two diagrams 8A and 8B Mode of action, in favor of a compressed air import for the further transport of Dirt speaks. Suction (Fig. 8A) distributes its effect in an open space over a spherical volume between the suction opening H and the conceptual surface FL (indicated by dashed lines) where the effect produces (or should be measured). A compressed air jet (also indicated by dashed lines, Fig. 8B) the same opening H remains compact for the time being and even pulls Ambient air U to itself. It is for a given energetic effort therefore possible a better transport (conveying) effect over a predetermined (especially a straight) route with a compressed air jet than with a To generate suction. The suction (working with negative pressure) remains for the removal over a longer, geometrically more complicated, by cables defined distance from the machine to a collection center relatively cheap.

It can be seen from Fig. 8B that the spiral shape shown in Figs. 5 and 6, respectively Air flow is not essential to the invention. The air intake could be parallel to Longitudinal axis of the discharge channel take place. It can also be seen from FIG. 8B that the use of a nozzle (with a light width smaller than that of the Discharge channel) is also not essential to the invention. The inflow of compressed air can in principle take place across the entire width of the channel.

The other figures deal with the second and third aspects of the invention. To initiate the corresponding explanation it can be noted that in the In most cases, the separating edge 24 in an arrangement according to FIG. 2 is much closer the lateral surface 31 is set as this for that opposite the drum Area 58 is possible - i.e. the working gap 10 spreads in the area downstream from the separating edge 24 in the radial direction to a degree different from that current setting of the knife 22 depends. In the working gap downstream from the separating edge therefore "lacks" the dissipated current component, the remaining one Share has to spread to fill the extended working gap. In the on the Separating edge 24 adjacent zone of the working gap is therefore under pressure. the possibly a little more air (loaded with dirt particles) between the Separating edge 24 and the outer surface 31 pulls than is actually desired. Also tends the spreading air flow to vortex formation at the separation edge 24 what Turbulence in the region 29 downstream of the separating edge 24 results. Such Turbulence can cause fibers to "roll together" or loop around one another lead - this creates nits. At most there can also be eddies in the Excretion gap itself form what air together with dirt particles in the working gap returns. The arrangements according to EP-A-848 091 have in this regard Brought improvements.

FIG. 9 now shows a further development of the arrangement according to FIG. 2, the same Reference numerals indicate the same parts: The blade 66 is in this Case firmly attached to the profile part 50A, the fasteners are not shown. Nevertheless, it is still necessary to immerse the edge 24 in the To be able to adjust fiber / air flow FLS. For a given working gap width SB upstream from the edge 24, the distance A of the edge 24 from the Shell surface 31 of the drum 30 can be variable to the deflected portion of the current To be able to choose FLS. The working gap width SB is due to a fixed guide element 60A specified.

In this case too, since an air inlet gap 72 is located downstream from the edge 24 is provided, the part 50A can now be moved to adjust the To enable separating edge. This mobility is shown schematically by arrows E. indicated. However, this means that not only the sheet 66 with the edge 24 but the guide surface 58 is also moved relative to the lateral surface 31. The default Relationship (the distance MA) between the separating edge 24 and the guide surface 58 becomes thus also maintained during or after the adjustment movement. This given Relationship determined by the aforementioned attachment of the blade 66 can be chosen such that no significant negative pressure downstream of the edge 24 arises.

One possible implementation is shown in FIG. 10. The discharge profile 50 comprises in in this case two parts 50A, 50B. The part 50A is provided with the guide surface 58 and is also provided with attachment lugs 80 in order to use clamping screws 82 together. These screws 82 and lugs 80 provide that Fasteners, whereby the sheet 66 is held on the profile part 50A. The second profile part 50B is formed in one piece with the guide element 60A. The part 50B is mounted next to a formwork segment V in the machine. A seal 90 is provided in this embodiment between the parts 50B and V, one Alternative is shown in Fig. 12. The two parts 50A, 50B together form one "Closed" discharge profile in that it is located at point 84 interlocking elements (namely with a groove 86 in part 50A and a corresponding attachment 88 are provided on part 50B). Therefore, if part 50B with respect to the drum 30, the part 50A can be moved linearly in order to change the immersion depth of the edge 24 without the elements 86, 88 out of mutual engagement. The parts 86, 88 together form one Labyrinth seal, an alternative is shown in Figure 12.

The embodiment according to FIG. 10 also includes a blade blade 66, which is separate from the Profile part 50A formed but attached to it. Sheet 66 may e.g. from hardened Steel can be made, while the profile 50 is made of a light alloy can be manufactured. Such an embodiment is particularly advantageous in the Precarding zone (above the licker-in 436, Fig. 1) because the device for processing newly introduced (not yet fully opened) fiber material is provided. In the Postcarding zone, where there is material carded through the revolving cover, is not absolutely necessary to use a separate blade. The separating edge 24 can can be provided directly on the profile part 50A.

The channel parts can be manufactured by extrusion. The two-part form of the discharge channel enables or facilitates the processing of the (compared to Channel) inside of the parts (e.g. by grinding and / or coating) or the Replace the divider.

It is of course not necessary to have the parts 50A, 50B as rigid, interlocking parts to build. It would be e.g. possible a flexible cover for channel K with two rigid parts to connect. The wall portion (62, Fig. 9) which supports the sheet 66 (or is provided with the edge 24), should be designed sufficiently stable to the to ensure set edge position and the guide surface 58 in one to maintain the predetermined relationship to the edge 24.

The working gap width SB (Fig. 9) can e.g. 0.6 mm to 1.5 mm (preferably 0.8 to 1.2 mm). The distance A is e.g. 0.3 to 2 mm. The maximum radial Spread MA of the working gap downstream from the edge 24 is approximately 0.5 mm, preferably 0.3 mm. However, this "spread" can be reduced to zero. she is definitely by attaching the blade blade 66 to the profile part 50A certainly.

An adjusting means for adjusting the immersion depth of the edge 24 is shown schematically in FIG Fig. 11 shown. The profile part 50A extends over the working width of the card between two so-called sheets 100, which are mounted in the card frame. This Sheets 100 themselves are adjustable in relation to the outer surface of the drum 30 also carry the profile parts 50B, which are not shown in FIG. 11 because they are firmly attached the bow 100 can be attached. The working gap width SB is therefore determined by the setting of the bow 100. The profile part 50A must be opposite Bow 100 can be adjustable in order to adjust the immersion depth.

The adjustment could be accomplished by an actuatable adjustment mechanism become. Each sheet 100 could e.g. carry a bracket 102 (Fig. 11), of which the one part 104 is fixedly movable on the respective sheet 100 and the other part 106 is arranged. Part 106 could e.g. an eccentric or an adjusting screw include. The part 106 engages or forms in the respective end of the profile part 50A a movable stop so that when part 106 is moved, part 50A is moved or moved accordingly. The parts 106 are slidable in radial Directions opposite the drum 30, so that the profile part 50A also in this Direction finely controlled movements.

In the preferred arrangement, however, the desired setting is by appropriate design of the bracket for the part 50A effectively chosen, the Part 50A assumes the required setting during assembly. One of those Solution can be realized by a bracket that the insertion or Removing spacers, part 50A preferably through Spring assemblies pressed against a stop formed by the spacers becomes. Such a solution also enables easy assembly by the part 50A first in the desired position (with the required attitude compared to the Drum) attached, after which part 50B when creating the labyrinth seal can be attached. For the same reasons, it's relatively easy to do that Disassemble and reassemble the module for maintenance purposes. Finally, the arrangement is also favorable in terms of production technology, because the two parts 50A, 50B can basically be produced by means of extrusion, the later inside of the channel K still accessible for any further processing (e.g. for coating or processing to accommodate the Fastener for the knife blade 66).

The second aspect of the invention is not based on the details of the embodiment according to FIGS 9 and 10 restricted. The separation point in the discharge profile 50 can be at another Place in the scope of the profile 50 are provided. The device can also be used on others Used in blowroom machines or cards, e.g. on one Runner, especially when there are several runaways.

The schematic representation in FIG. 12 represents both a possible Alternative embodiment of the second aspect of the invention, as well as an example of the third aspect. The reference numerals of Figure 12 are therefore the reference numerals of Figures 9 and 10 largely the same, with which the two forming the channel K. Channel parts 50A, 50B, the drum surface 31, the drum direction of rotation D, the Edge 24, the working gap 10, the distance SB, the separation gap 18 and that previous working element V are again indicated. One is new in FIG. 12 Air supply opening LZ between element V and part 50B, i.e. the gap between these parts is left open (unsealed, see Fig. 10), with which air can flow into the working gap 10 via the feed opening LZ. It is also new an elastic sealing element ED between the two channel parts 50A, 50B. This Element ED sits in a receptacle DA on part 50A, with a contact part KP of the Part 508 printed firmly against the seal when assembled in the card (not shown) becomes. The channel part 50B is also in the example according to FIG. 12 with an exchangeable one Provide foot F, which defines a guide surface LF, which with the drum surface 31 gives the distance SB. The double arrows P1, P2 and P3 now show schematically three additional settings made by means of the new arrangement according to FIG. 12 enabled and described individually below, assuming is that the channel part 50A also (as already described) compared to the Drum surface area can be adjusted. The elastic seal ED only shows a possible alternative to the labyrinth seal according to FIG. 10 Descriptive effects can also be achieved with other seals, especially the Maze seal can be achieved.

According to DE-A-39 02 204, it is provided that technologically effective parts of a To attach dirt separating device individually to a common support, the individual adjustability and thus the optimization of the technological Enable effect. In contrast, according to the present invention "Carrier parts" (in FIG. 12, parts 50A and 50B) are adjustable relative to one another arranged to enable the optimization of the technology.

A particularly important setting variable is the width of the separation gap 18, i.e. the distance (also indicated by a double arrow) between the edge 24 and the foot F. This width can be indicated by the arrow P1 Adjustment movements of the channel part 50B are influenced, being provisional it is assumed that the channel part 50A remains fixed in relation to the drum The sealing element ED and its receptacle DA are so generous dimensioned so that the intended movements P1 can be carried out, without affecting the sealing effect. It will therefore be clear that a corresponding technological effect by adjusting the channel part 50A in Drum circumferential direction could be achieved.

If the channel portion 50B is adjusted to affect the width of the gap 18, At the same time, the width of the air supply LF changes, as indicated by the arrow P3 becomes. As a result, the air supply quantity upstream of gap 18 can be influenced become. The purge air supplied here is at least for the most part immediately following separation gap 18 removed from the working gap 10 again, but can for Transporting the dirt particles play a role.

The distance SB can be adjusted by moving the channel part 50B in the arrow directions P2 to be influenced. This requires either maintaining the sealing effect on Element ED despite a possible decrease in the contact pressure between the Contact section KP and the reception DA, or the replacement of the element ED by a gasket adjusted in thickness. The labyrinth seal according to FIG. 10 gives in this relationship greater freedom.

In principle, a similar effect can be achieved by exchanging the foot section F be achieved, e.g. on the basis of replacement by a batch of greater thickness. The exchange of the foot also enables the optimization of even more Technology parameters, e.g. the flow profile in the working gap 10. This effect is 13 shows where the sheet 66 with the edge 24 as "Reference" serves. The cross section of the foot F can now be used when replacing the foot section to be changed. Fig. 13 shows e.g. with solid lines a first foot of F1 with a guide surface LF, which widens the working gap 10 in the direction of Edge 24 results. The dashed lines, on the other hand, show a foot F2, which is none Allows spreading of the working gap 10 in the direction of the edge. The Flow velocity in the working gap is used when using foot F2 for a given amount of air in this gap will be higher, but with air from the fiber / Airflow FLS must be deflected relatively strongly into the separation gap 18. It is also possible, the material or the surface quality of the foot area F at Replace to change, whereby the foot processed to various Fiber materials (e.g. chemical fibers, cotton fibers, rain type fibers) and / or on the average staple length of the processed fibers can be adjusted.

The foot section can also be provided with a "structured" surface, i.e. she can, for example, be provided with grooves (viewed in the direction of flow), which have a curved or angular cross section. The foot area could in particular with a guide element according to EP-A-388791.

Claims (12)

1. A contamination separating device (50) with at least one separating gap (10), a longish contamination discharge channel (K) that extends across the operating width and a suction means (AE) at the end of the channel, characterised in that, means are provided in order to feed blowing air into the channel (K).
2. A contamination separating device (50) according to claim 1, characterised in that said means to feed blowing air is arranged at the other end of the channel, opposite the suction means (ZE).
3. A contamination separating device (50) according to claim 1, characterised in that at least one means to feed blowing air is positioned in the centre of the channel and that on both sides a suction means is being arranged.
4. A contamination separating device (50) according to claim 1, characterised in that the means to feed blowing air is arranged across the operating width of the channel.
5. A contamination separating device (50) according to one of the preceding claims, characterised in that said means to feed blowing air is a tube nozzle (RD).
6. A contamination separating device (50) according to one of the preceding claims, characterised in that said means to feed blowing air is arranged slanted in the channel.
7. A contamination separating device (50) according to one of the preceding claims, characterised in that said means is provided with a flow cross section that feeds the blowing air in form of a bundled jet.
8. A contamination separating device (50) according to claim 7 characterised in that the flow cross section of the nozzle corresponds approximately 12 % to 25% of the flow cross section of the channel.
9. A fibres processing machine, characterised in that it comprise a contamination separating device which is laid out according to one of the preceding claims.
10. A fibres processing machine according to claim 9, characterised in that said machine is a card and that the contamination separating device is arranged to a cylinder.
11. A fibres processing machine according to claim 10, characterised in that the card has a larger operating width than 1000 mm, preferably between 1300 mm and 1500 mm.
12. A fibres processing machine according to claim 9, characterised in that the machine is a card filling chute (8) with a cleaning module, consisting of at least one disolving cylinder (33) and that the contamination separating device (104, 106' 108) is arranged to this disolving cylinder (33).

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